Espresso machine



FIG. 1 is a front perspective view of an espresso machine showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a rear perspective view thereof.

The broken lines of FIG. 2 illustrate portions of the espresso machine that form no part of the claimed design. 

CLAIM The ornamental design for an espresso machine, as shown and described. 